For my own part I have no theory upon the subject--would have no theory. The problem of the origin of the American aborigines is, in my opinion, enveloped in as much obscurity now as it ever was; and when I consider the close proximity of the north-western and north-eastern extremities of America to Asia and Europe; the unthought of and fortuitous circumstances that may at any time have cast any people upon the American coasts; the mighty convulsions that may have changed the whole face of the earth during the uncounted years that man may have dwelt upon its surface; and lastly, the uncertainty, perhaps I might say improbability, of the descent of mankind from one pair;--when I think of all these things it seems to me that the peopling of America may have been accomplished in so many ways that no more hopeless task could be conceived than the endeavor to discover the one particular manner of it.
In the following résumé I wish neither to tear down nor to build up, but simply to give an account of what has been thought and written upon the subject, and to show, with as little criticism as possible, the foundation upon which each theory stands. Of the comparative value of the opinions the reader must be his own judge. Of the value of this discussion of the subject there is this to be said; as a curiosity, showing the color given to mind by its environment, showing the blind and almost frenzied[I-7] efforts of different men of different epochs, creeds, and culture, to fathom a hitherto unfathomable mystery,--this, together with the collateral light thrown upon the subject of aboriginal America, if there be no other advantage in it, will amply repay the investigation.
The earliest writers required three propositions to be taken for granted:[I-8] First, that the entire human race are descended from one original pair, and from Noah through Shem, Ham, and Japheth; second, that America was peopled from one of three sources--Asia, Africa, or Europe; third, that all knowledge arises from one of four sources--knowledge pure and absolute, from a knowledge of causes; opinion more or less uncertain; divine faith, sure and infallible, based upon the holy scriptures as interpreted by the Church; human faith, dependent upon the statements of men. The first of these four sources of knowledge throws no light upon the subject; the third is equally useless here, since the scriptures are silent after the time of Noah, though, as we shall presently see, huge endeavors have been made to make them speak; as for the fourth, Europeans, even if they conjectured the possible existence of an undiscovered continent, were certain that it was not inhabited,[I-9] while the Americans were entirely ignorant of the part of the world from which they sprang.